我对android很新。我想在我的应用程序中使用2个微调器，一个显示国家/地区列表，当选择任何国家/地区时，其他微调器应显示该国家/地区的城市列表。选择城市时，会执行某些操作。 PLZ帮我一些示例代码。在期待中感谢
答案 0 :(得分：10)
以下是我们可以使用的方法将spinner2 w.r.t的选项添加到微调器1中。
public class Activity extends Activity implements View.OnClickListener
{
private Spinner spinner0, spinner1, spinner2, spinner3;
private Button submit, cancel;
private String country[], state[], city[], area[];
Australia aus = new Australia();
Object object;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
spinner0 = (Spinner)findViewById(R.id.spinnerCountry);
spinner1 = (Spinner)findViewById(R.id.spinnerQ1);
spinner2 = (Spinner)findViewById(R.id.spinnerQ2);
spinner3 = (Spinner)findViewById(R.id.spinnerQ3);
submit = (Button)findViewById(R.id.btnSubmit);
cancel = (Button)findViewById(R.id.btnCancel);
submit.setOnClickListener(this);
cancel.setOnClickListener(this);
country = new String[] {"Select Country", "Australia", "USA", "UK", "New Zealand", "EU", "Europe", "China", "Hong Kong",
"India", "Malaysia", "Canada", "International", "Asia", "Africa"};
ArrayAdapter<String> adapter0 = new ArrayAdapter<String>(Activity.this, android.R.layout.simple_spinner_item, country);
adapter0.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner0.setAdapter(adapter0);
Log.i("AAA","spinner0");
spinner0.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View view1, int pos, long id)
{
Log.i("AAA","OnItemSelected");
int loc;
loc = pos;
switch (loc)
{
case 1:
state = aus.getState();
object = aus;
Log.i("AAA","ArrayAdapter1");
ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(Activity.this, android.R.layout.simple_spinner_item, state);
adapter1.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner1.setAdapter(adapter1); Log.i("AAA","spinner1");
break;
default:
Log.i("AAA","default 0");
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg1)
{
Log.i("AAA","Nothing S0");
}
});
spinner1.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View view1, int pos, long id)
{
Log.i("AAA","OnItemSelected S1");
int loc = pos;
switch(loc)
{
case 1:
Log.i("AAA","Australia");
if(object.equals(aus))
{
city = aus.getType(loc);
}
else
{
break;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(Activity.this, android.R.layout.simple_spinner_item, city);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner2.setAdapter(adapter); Log.i("AAA","spinner2");
break;
default:
Log.i("AAA", "default 1");
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
Log.i("AAA","Nothing S1");
}
});
spinner2.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int pos, long id)
{
int loc = pos;
switch (loc)
{
case 1:
if(object.equals(aus))
{
area = aus.getTitle(loc);
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(Activity.this, android.R.layout.simple_spinner_item, area);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spinner3.setAdapter(adapter); Log.i("","spinner3");
break;
default:
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
// TODO Auto-generated method stub
}
});
}// on-create
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.btnSubmit:
break;
case R.id.btnCancel:
finish();
break;
default:
break;
}
}
}
如果您觉得这很有用，那么请放弃投票，以便其他人可以轻松找到一个好的答案。
对于每个国家/地区，您必须为其创建一个类，只需添加State，City＆amp;区域。这样它就不会成为单页的网格。
玩得开心。
此致
HAPS。
答案 1 :(得分：3)
下面是一个示例代码，它描述了在选择微调器项目时执行的微调器和操作的用法
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
public class MainActivity extends Activity {
Spinner spin;
String spin_val;
String[] gender = { "Male", "Female" };//array of strings used to populate the spinner
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);//setting layout
spin = (Spinner) findViewById(R.id.spinner_id);//fetching view's id
//Register a callback to be invoked when an item in this AdapterView has been selected
spin.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long id) {
// TODO Auto-generated method stub
spin_val = gender[position];//saving the value selected
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
//setting array adaptors to spinners
//ArrayAdapter is a BaseAdapter that is backed by an array of arbitrary objects
ArrayAdapter<String> spin_adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, gender);
// setting adapteers to spinners
spin.setAdapter(spin_adapter);
}
}
要向微调器添加值列表，您需要在Activity中指定一个SpinnerAdapter，它扩展了Adapter类。微调器适配器允许定义两个不同的视图：一个显示微调器本身的数据和当按下微调器时，显示下拉列表中的数据的那个。你也可以下载＆amp;请参阅完整的spinner_demo示例项目以便更好地理解。
答案 2 :(得分：2)
检查以下示例：
https://developer.android.com/guide/tutorials/views/hello-spinner.html
http://www.designerandroid.com/?cat=4
答案 3 :(得分：0)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner)findViewById(R.id.spinner);
list = new ArrayList<String>();
list.add("Select your Favorite Color");
list.add("Blue");
list.add("White");
list.add("Red");
list.add("Green");
list.add("Black");
list.add("Yellow");
list.add("Pink");
list.add("Orange");
SpinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list){
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = super.getView(position, convertView, parent);
// set the textColor you want
return v;
}
@Override
public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
View v = super.getDropDownView(position, convertView, parent);
// Set the BackgroundColor
return v;
}
};
SpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(SpinnerAdapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
String state = adapterView.getItemAtPosition(i).toString();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
}